Interstate 270 bypasses St. Louis
on its northern and western sides. The highway runs from
Interstate 55 southwest of St. Louis, then north to just past
Interstate 70, where it curves to the east, and heads due east
until its eastern end at Interstate 55 and Interstate 70 in
Illinois. On Day Five of the Fields Trip, I drove Interstate 270
from Interstate 55/70 to Interstate 255 in Illinois, and from
Interstate 55 to Interstate 44 in Missouri.